• 제목/요약/키워드: Edger

검색결과 22건 처리시간 0.023초

자동 시각 검사를 위한 개선된 서브픽셀 알고리즘 (An Improved Subpixel Algorithm for Automated Visual Inspection System)

  • 장동식;이만희;김길동
    • 산업공학
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    • 제11권3호
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    • pp.15-22
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    • 1998
  • A new improved algorithm in edge location to subpixel accuracy using decent-based weight to spatial information is proposed in this paper and applied to automated visual inspection(AVI) system. An application of the new edge operator as an edge detector is also provided and compared with Tabatabai and Lyvers edge detectors. The existing algorithms located edger to subpixel accuracy using least-square or moment-based methods. The algorithms also use only spatial information or grey-level values to locate edges. However, the proposed algorithm consider the weighted sum of grey-levels values of each edge pattern. The results show that the proposed algorithm is relatively less biased and has smaller standard deviation than the edge operations developed by Tabatabai and Lyvers in the presence of noise.

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포항2열연 조압연스탠드(RM) 유압연시스템의 개발과 적용 (Application of hot rolling oil lubrication on RM stands at Pohang Hot Rolling Mill No.2)

  • 김철희;조준길;유문석;한영환
    • 한국윤활학회:학술대회논문집
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    • 한국윤활학회 1997년도 제26회 추계학술대회
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    • pp.161-166
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    • 1997
  • Application of hot roiling oil lubrication technology was broadened to the field of RM stands of Hot Rolling Mill at Pohang works. The primary object was to improve the quality of the strip sttrface and the rolls by oil lubrication in hot rolling process. Prior to the actual field application preliminary test was conducted to evaluate the effect of hot rolling oil lubrication at RM stands. From the test, it has been found that the use of oil lubrication tends to prevent the progression of the heat cracks and thereby increases the quality of the strip surface and the wear life of the rolls. New hot rolling oil lubrication system was applied to the RM stands VSB, R1, R2, R3, R4 and edger rolls. With the introduction of a rolling lubricant, the quality of the strip surface and rolls was improved and overall roll dressing has decreased. Also there has been a improvement of productivity from the long roll life.

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후판 선후단에서의 비정상변형부 폭제어기술 (Width Control of the Top and Bottom Ends of Steel Plate by Using Short-Stroke edging in Plate Mill)

  • 정대섭;남구원;천명식
    • 한국소성가공학회:학술대회논문집
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    • 한국소성가공학회 1999년도 제3회 압연심포지엄 논문집 압연기술의 미래개척 (Exploitation of Future Rolling Technologies)
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    • pp.429-437
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    • 1999
  • Width variation of the top and bottom ends of steel at finishing rolling in a plate, has been investigated. It was found that width variation after finishing rolling is affected by edging, broadside rolling ratio, longitudinal rolling ratio, width shape after broadside rolling, temperature, width-to-thickness ratio, and so on. A neural network modelling of back propagation has been conducted on the width variation during rolling. Based on these prediction models, a width control system, by which the roll opening and closing of the hydraulic AWC edger can be adjusted during edge rolling in finishing rolling passes, has been developed. Compared to conventional width model, the neural network model is much accurate in a model. The width control system is applied to a newly built production mill.

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CCD 폭 측정 시스템 및 퍼지 PID를 이용한 CFWC 제어기 설계 (CFWC Scheme for Width Control using CCD Measurement System and Fuzzy PID Controller in Hot Strip Mills)

  • 박철재
    • 제어로봇시스템학회논문지
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    • 제19권11호
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    • pp.991-997
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    • 2013
  • In this paper, we propose a CFWC (CCD and fuzzy PID based width control) scheme to obtain the desired delivery width margin of a vertical rolling mill in hot strip process. A WMS(width measurement system) is composed of two line scan cameras, an edge detection algorithm, a glitch filter, and so on. A dynamic model of the mill is derived from a gauge meter equation in order to design the fuzzy PID controller. The controller is a self-learning structure to select the PID gains from the error and error rate of the width margin. The effectiveness of the proposed CFWC is verified from simulation results under a width disturbance of the entry in the mill. Using a field test, we show that the performance of the width control is improved by the proposed control scheme.

수직압연에 대한 압하력 예측 모델 (A FE-based Model for Predicting Roll Force in a Vertical Rolling Process)

  • 윤덕중;김용기;황상무
    • 소성∙가공
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    • 제20권8호
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    • pp.548-554
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    • 2011
  • A Finite Element (FE)-based model is proposed for predicting the roll force in an edger. The model is developed on the basis of the hypothetical mode of rolling and the least-squares regression analysis from the result of the FE approach. This model reflects the effect of process variables affected by the roll force, and has three dimensionless parameters, I.e., shape factor, reduction ratio and width-to-thickness ratio. The model prediction compared satisfactorily with experiment observations.

Effect of Shiitake(Lentinus edodes. p) Mushroom Powder and Sodium Tripolyphosphate on Texture and Flavor of Pork Patties

  • Chun, S.S.;Edger Chambers IV;Delores H. Chambers
    • 한국식품영양학회:학술대회논문집
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    • 한국식품영양학회 2004년도 하계 학술 심포지엄
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    • pp.48-48
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    • 2004
  • Shiitake mushroom contained numerous nutrients, special flavor (lenthionine) and taste. In Asia, they are thought to have numerous medical properties f3r several diseases such as diabetes, anemia, tumors. Phosphates are known to increase hydration and water binding, stabilize meat emulsions, improve juiciness and tenderness, provide mineral supplementation, and maintain flavor of processed meat products. A lexicon f3r describing the texture and flavor of cooked pork patties were developed. (omitted)

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열간압연시 폭퍼짐 보상을 통한 폭정밀도 개선연구 (Precise width control through the width spread compensation in hot strip mill)

  • 천명식;이준정;문영훈
    • 소성∙가공
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    • 제8권2호
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    • pp.200-207
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    • 1999
  • To increase dimensional accuracy of strip width, model to compensate width spread during roughing mill has been developed. To measure the amount of width spread during the production rolling more precisely, special roughing rolling procedures for the horizontal rolling and dog-bone rolling were designed in the actual production mill. From the operational data analysis, it is known that the prime factors influencing on the width spread were strip width, strip thickness, edging amount, number of pass and type of edger roll etc., Based upon the statistical analysis of rolling data, new models which can predict width spread during horizontal rolling and dog-bone rolling were developed and tested on the actual processing conditions for the reliability. The application test showed that newly developed model gave fairly accurate predictions on the width spread during roughing passes.

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차원 해석을 이용한 수직압연에 대한 도그본 형상 예측 (Dimensional Analysis of Edge Rolling for the Prediction of the Dog-bone Shape)

  • 윤덕중;황상무
    • 소성∙가공
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    • 제21권1호
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    • pp.24-29
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    • 2012
  • Precision control of the width of slabs is vital for product quality and production economy in steel rolling mills. However, the formation of so called 'dog-bone' at the edge of the slab would affect the final width during the horizontal rolling that follows. Therefore, it is essential to predict and control the dog-bone shape. In this paper, a model is derived by using a number of finite element simulations for edge rolling and a least square regression analysis. The prediction accuracy of the proposed model is examined by comparing the predictions from finite element simulation with experiment results in the literature.

사이징 프레스에서 폭 압하 공정중 결함 저감을 위한 엔빌의 형상설계 (Design of the Anvil Shape in Sizing Press for Decrease of the Defect Generated Width Reduction)

  • 이상호;이성진;이종빈;김병민
    • 소성∙가공
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    • 제18권1호
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    • pp.52-58
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    • 2009
  • Generally, a vertical rolling process is used to achieve extensive width reduction in hot strip mill. However, it is impossible to avoid the defects such as dog-bone and edge-seam defect. The sizing press process has been developed in response to the defects mentioned above. Especially, this study is carried out to investigate the deformation of slab by two-step sizing press. The deformation behavior of slab in the sizing press process is more favorable than that in conventional vertical rolling edger. The FE-simulation is applied to predict the deformation behavior of the slab. In this paper, the several causes of the asymmetrical deformation are mentioned for the purpose of understanding of the anvil shape. Load, dog-bone and edge-seam defect are discussed in width sizing process considering the anvil shape. And to reduce the problems generated at rougher mill just after sizing press, these are studied in this paper. The deformation behavior of slabs and optimum anvil shape are obtained by rigid-plastic finite element analyses and neural network.